Furnace



Jan. 25, 1927.

A. 1..- SCHELLHAMMER4 FURNACE Filed May 7, 1925 P Sneets+$heet 1 INVENTOR. 8 4. L ,Sc/fefl/zamme f7 jr rb Y Jan. 25, 1927.

A. L. SCHELLHAMMER FURNAC E Filed May '7. 1925 2 Snee ts-Shee'L -2 INVENTOR. A. L .SChe/UI BY dmmer ll! 5? ATTORN Patented Jan. 25, 1927.

UNITED STATES ALFRED L. sonnmna vriyrnn, or wannnn, rnlsnsylivama.

summon.

Application filed. ma 7, 1925. Serial No. sense.

The present invention relates to furnaces, and more especially to that class of furnaces or heaters adapted to burn a variety of fuels such, for example, as coal, wood, gas or oil.

An object of the invention is to provide a furnace of this class in which a plurality of fire chambers are provided adapted to burn difierent kinds of fuel and so arranged as to give a maximum heating efficiency to the entire furnace.

Another object of the invention .is to provide a furnace of this class in which "the gas fire chamheris so arrangedJthat cold air may be brought into the furnace casing at almost any point and can flow under it, around it, and rise above it.

A further object of .the invention is to provide ,in such a furnace a gas fuel'heat radiating drum which communicates with the solid fuel fire chamber in the upper part thereof above'its grate and preferably only at a single point.

A still further objectof the invention is to provide a furnace in which the'burned gases from the gas fuel fire chamber pass into a gas fuel radiatingdrum, from which they are delivered into theupper part of a solid fuel fire chamber, so that from ,this

point such gases may have the same direction as the burned gases from thesolidfuel, and may pass from the upper portion of the solid fuel :firelchamber-either directly into a flue: or from the upper portion of the SOl'LCl fuel the chamber round through a heat-rad ating drum and thence to said fine, the direction to be taken by suchlnu'ned gases being subject to manual or othercontrol.

Other objects and advantages of the inven tion will in part be apparentand in part appear frointhe following detailed description, taken in connection with the accompanying drawings, which illustrate, by way of example, one preferred embodiment thereof, but which are not to be taken as a definitionv of, the limits of the invention, reference beinghad to the appended claim for that purpose. In the drawings:

Fig. 1 is a horizontal section taken through aform of furnace embodying the'pr'esent inyention and taken on the line 11 of Fig. 2;

Fig. 2 is a vertical sectional view of the furnace talren on the line 22 of Fig. 1;

Fig. 8 is horizontal section taken on the line 3-3 of ig. 2; I

Fig. 4 is a vertical section taken on the line 4-4 of Fig. 3'. i I

Referring in detail to said drawings, a

casing 11 has preferably centrally located therewithin and spaced from the inner walls thereof a cylindrical solid fuel firec hamber 12 provided with any suitable form of grate 13, for burning such fuels as coal or wood,

and provided with any suitable form of burner 13" for burning oil or other liquid i-ng other fuels.

LUppe-r and lower 'doorsl fand 15 areprovidedin-the casing 11 to afford anjentr'ance to the sol-id fuelfire chamber aboveand be ,LOW said grate, respectively. In the upper portion of the solid fuel fire chamber an opening 16 is provided, whiclr leads through the passage 17 into a radiating drunr-TlS, which is preferably circular in form and surrounds the upper portion'of the solid fuel fire chamber i2,"b'eing spaced from its wall and the wall of the casing.

Referring particularly to Fig. 1, it will be seen that a baflie 19 is arranged ding ona-lly inthe radiating drum 18'fro1n the inner wall to-the outer wall thereof, and this baflie is located in front of the passage 17 and extends from the bottom of the radiating drum -1 8 to the top thereof. -'On the other side of the baflie 19 and" directly opposite to the passage'l'i" a flue 20 is providedto conduct away burned gases and smoke from the furnace. The baffle l9is provid'ed with ,a passage 21 therethrough, in which is 10- cated a damper 22 adapted to open or close the passage 21. It will thus be observed that by manipulating the damper 22 the smoke and burned gases from the solid fuel fire chamber may be directed from the top of said chamber through the drum-connecting passage 17, through the passage 21 in the baffle 19, and directly on out through the flue 20, this being the direction taken, for example, when the furnace is first started in operation, and it is important to have a strong and direct draft. At other times the burned gases and smoke from the solid fuel fire chamber 12 may, by closing the damper 22 and thus closing the passage 21, be directed circularly around through the circular radiating drum 18 and thence out through the flue 20.

In the present embodiment of the invention a gaseous fuel fire chamber 23 is located at one side of the solid fuel fire chamber 12, into which leads a pipe 24 for the purpose of conveying gaseous fuel to the burner 25 located in the fire chamber 23. The casing 11 is provided with a suitable door 26 affording entrance to the fire chamber 23, as shown in Fig. 2.

The gaseous fuel fire chamber 23 is preferably arcuate in form, as shown in Fig. 1, and, as will be seen in Fig. 2, is spaced all around from the floor of the furnace casing, from the bottom of the radiating drum l8, and on its sides from the walls of the casing 11 and the solid fuel fire chamber 12.

At each end of the arcuate gaseous fuel fire chamber 23 an opening isprovided and each of these openings is connected by a conduit 27 to an opening formed in the lower portion of the arcuate gaseous fuel radiating drum 28. The radiating drum 28 is preferably arranged higher than the fire chamber 23, and in addition to being spaced from the inner wall of the casing and the outer wall of the solid fuel fire chamber 12, is also spaced from the floor of the casing and from the bottom of the radiating drum 18. The radiating drum 28 is also preferably provided with vertical through pipes 29'open at their tops and bottoms, but having closed side walls for the purpose of assisting in the transfer of heat by radiation and convection.

Near the top of the radiating drum 28 a passage 30 connects said drum with the solid fuel fire chamber 12 near the upper portion thereof and above the level of the grate and any combustible material which may be thereon.

It will be seen that the smoke and burned gases from the gaseous fuel fire chamber 23 are, after passing through the gas radiating drum 28, directed into the upper portion of the solid fuel fire chamber 12 above the fuel level thereof and that these gases thereafter will pass out of the furnace and into the flue along the same path taken by the smoke and burned gases from the solid fuel fire chamber, namely, either through the passage 17 and directly into the flue if the damper 22 is open, or through the passage 17 and around through the radiating drum 18 into the fine on the other side of the baffle if the damper 22 is closed.

Considerable difficulty has been experienced with furnaces adapted to burn different kinds of fuel, but it will be noted that in the present invention the burned gases and smoke from the gaseous fuel are not forced up through a bed of coals or other solid fuel, nor are they passed directly out of the furnace before yielding up their heat, but are passed from the gaseous fuel chamber through a gaseous fuel radiating drum and thence into the upper portion of the solid fuel fire chamber above the grate and above the fuel level thereof and thereafter take the same path as the smoke and burned gases from the solid fuel fire chamber, namely, either through a second radiating drum and thence to the fine or directly into the flue without circling through the second. radiating drum.

It will also be seen that the gaseous fuel fire chamber may be located as far above the bottom of the furnace as may be desired so that cold air may be brought into the furnace at almost any point without interfering in any way with the delivery of the smoke and'burned gases from said gaseous fuel fire chamber into the solid fuel fire chamber because such delivery takes place at any point above the level of the solid fuel.

It will also be seen that there is preferably only one inlet from the gaseous fuel radiating drum into the solid fuel fire cha1uher.

In the following claim, the term solid fuel fire chamber refers to the chamber in which fuels are burned such as oil, coal or wood.

vVhat is claimed is:

A furnace including a casing, a central cylindrical solid fuel fire chamber within said casing, spaced from the interior walls thereof, and provided with an entrance through said casing, a semicircular auxiliary fire chamber in said casing on one side of said solid fuel fire chamber and having an entrance through said casing, a semicir cular auxiliary radiating drum on the other side of said solid fuel fire chamber and communicating at its lower ends with the upper ends of said auxiliary fire chamber, air pipes passing vertically through said radiating drum, the upper portion of said radiating drum communicating with the interior of said solid fuel fire chamber, a circular upper main radiating drum surrounding said solid fuel fire chamber and having an opening communicating therewith at the upper portion thereof, a baflie provided with a damper and extending from the interior Wall of said radiating drum to the other side of said bafile and adapted, when exterior Wall thereof and in front of said said damper is open, to receive burned 10 solid fuel fire chamber communicating gases directly from said solid fuel fire opening and adapted, when said damper chamber.

v is closed, to deflect burned gases from said In testimony whereof I afiix my signasolid fuel fire chamber circularly through ture. said radiating drum, and a smoke flue c0mmunicating With said radiating drum on the ALFRED L. SCHELLHAMMER. 

